/**
* Get protection Rule Model.
*
* Note for network-wide mode:
* In DB the rules for each site are stored in different objects.
* When loading a membership we will always load 1 instance of each
* rule_type, and this is the instance that belongs to the current site!
* Instances for other sites are not accessible.
* -> This is why we do not use/need a site_id or similar in this function.
*
* @since 1.0.0
* @api
*
* @param string $rule_type The rule model type @see MS_Rule
* @return MS_Rule The requested rule model.
*/
public function get_rule($rule_type)
{
if ('attachment' === $rule_type) {
$rule_type = MS_Rule_Media::RULE_ID;
}
if (!isset($this->_rules[$rule_type]) || !is_object($this->_rules[$rule_type])) {
// Create a new rule model object.
$rule = MS_Rule::rule_factory($rule_type, $this->id, $this->subscription_id);
$rule = apply_filters('ms_model_membership_get_rule', $rule, $rule_type, $this);
$this->_rules[$rule_type] = $rule;
if (!is_array($rule->rule_value)) {
$rule->rule_value = array();
}
}
return $this->_rules[$rule_type];
}
